Drinking age

Change the age for drinking to 18 years old

Once a young man or women has reached the age of 18 they are considered an adult. We are able to join the military, fight in war, and buy tobacco. So the question I ask is why can we not as 18 year old adults consume alcohol? In other countries in the world children grow up drink small amounts of alcohol It works just fine there. They do not go as wild the day they are legally able to drink because the have grown up with it all there lives. So why would this not work for the United States of America